1、【题目】The Salk vaccine is a major factor in the fight to eradicate polio.

选项：

A.completelydestroy

B.carefullydisguise

C.sustain

D.contain

答案：

A

解析：

暂无解析

1、【题目】Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .

选项：

A.hostile-looking

B.perceptive

C.primitive

D.strangelyformed

答案：

C

解析：

暂无解析

1、【题目】Urban renewal programs strive to upgrade areas that are becoming slums.

选项：

A.reproach

B.improve

C.fortify

D.uproot

答案：

B

解析：

暂无解析

1、【题目】The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.

选项：

A.slithering

B.radiating

C.interfering

D.murmuring

答案：

B

解析：

暂无解析

1、【题目】The future survival of the bald eagle is still an important American ecological concern.

选项：

A.migration

B.population

C.existence

D.evolution

答案：

C

解析：

暂无解析

1、【题目】Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.

选项：

A.obligations

B.qualities

C.links

D.needs

答案：

解析：

1、【题目】When carbon is added to iron in the proper proportions , the result is steel.

选项：

A.container

B.sequence

C.laboratories

D.amounts

答案：

D

解析：

暂无解析

1、【题目】Oneofthegreatestbreakthroughsforprofessionalwomencamein1973whenthefieldofbankingopenedupforthem.

选项：

A.mostseriousdisappointments

B.mostsignificantadvances

C.mostabruptdeclines

D.mostcrucialsituations

答案：

解析：

1、【题目】Ella Grasso, elected governor of Connecticut in 1974, supported the enactment (given, granted) of a freedom-of-information law.

选项：

A.passing

B.advocates

C.drafting

D.circulation

答案：

A

解析：

暂无解析

1、【题目】By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.

选项：

A.almost

B.definitely

C.already

D.universally

答案：

A

解析：

暂无解析

1、【题目】The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.

选项：

A.occurrence

B.remnants残留物

C.witnesses

D.parallel

答案：

D

解析：

暂无解析